Improvement in machines for trimming lumber



PATENT FFIC GEORGE w. NIeHoLs, or' eLiNroN, Iowa.I

IMPROVEMENT IN vMACHINESS FOR TRIMMENG LUMBER.

Speciication l'orining part of Letters Patent No. 206,932, dated ngnst 13, ISTH; application filed July 25, 1877.

To all whom it may concern:

Be it known that I, GEORGE WASHINGTON NICHoLs, of Clinton city, in the county of Clinton and State of Iowa, have invented certain new and useful Improvements in Lumber- Trimming Machines; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

Figure 1 is a plan view, showing the races without the carrying-chains. Fig. 2 is a transverse view on line x w of Fig. 1. Fig. 3 is a longitudinal Vertical section on line y y of F103 1. Fig. 4 is a transverse section online z z of Fig. 1. Fig. 5 is a plan view of a portion of one of the races with the carrying-chain enlarged. Fig. 6 is a vertical longitudinal seetion on line 8 of Fg. 1.

My invention relates to that class of lumber-trimming machines which cut the lumber to a uniform length; and the particular object of the invention is to provide a machine to cut the lumber square at the euds, and one end at a time, and will hold the lumber while being cut, so that it will not tremble or swing around'or pinch the saw, as hereinafter described.

In the drawings, A represents the frame of the machine, upon which are arranged, on proper arbors, the saws B O D. E E E112.2 Ea are races or guides for the carrying-chains and rests for the lumber. F F'represent shafts, provided with ,hand-wheelsl), and with pinions M,'adjusted to rtrawel in fixedracks a attached to the frame and in racks a1 on guideplates (L2 'attached to the end guides E, as shown in Figs. 1 and 3-of the drawings, for a-djusting laterally the end guides and saws. G represents the carrying-chains, which are provided with lugs lt: 'at right angles to the face of the chains. H is a lever pivoted to the frame, and connected at the inner end to a vertically-sliding frame, upon which is mounted the saw G. J is a lever'pivoted to the frame, and connected at the inner end to the friction feed-wheel K, adjusted to slide back and forth on the feathered shaft K', for regulating the feed and operatin g the wheel L on shaft I,

connected with the gearin g which operates the carrying-chains. The feed of the lumber to the saws is regulated by the adjustment of the wheel K, which is moved outward to increase the feed and inward toward the center of wheel L to lessen the feed.

N represents pulleys on the arbors of the saws and of the wheel K. The saw-arbors O O' are provided with splines fitting in grooves in the hubs of the saws B D, which are adjusted to slide back and forth on their arbors.

T represents shafts, having their bearings on the frame, and provided with sprocketwheels T' for Operating the carrying-ehains. The end guides E and their sprocket-wheels are adjusted to slide back and forth on the shafts T, which are provided with splines fitting in grooves in the sprocket-wheels.

The hubs of the saws B D are provided with grooves to receive pins b attached to the guides E, as seen in Fig. 6 of the drawings, for connectin g the end guides and saws together, so that they may be adjusted laterally together for the purpose of keeping these end guides and their carrying-chains always close to the saws, to prevent the springing and treinbling of the lumber while in cut.

The saws are arranged on separate arbors on the machine, to cut the lumber at right angles to the edge or side resting againstipthe lugs on the chains; and the saw B s `}placed on the machine in front of the sawl)j,`{ so that one end of the lumber may bc cut at a time, to prevent the pinching of the saws,`which often oecurs when both ends of the lumber are cut at the same time.

The end guides and saws being adjnsted laterally in position for cuttin g the lulnbe'rthe required length, and the lumber placed on the machine in front of the saw the lugs on the chains move the luinber against that saw, which cuts one end, and then against saw I), which cuts the other end of the lumber, which is then moved off the machine.

When the lumber is to bc cut shorter than 'can be convenientl y cut by the saws B D, the saw (J is raised by the lever H into position for cutting, as shown by dotted lines in Fig. 2 of the drawings.

VVhat I claim, and dcsire to secure by Letters Patent, is-

1. A machine for trhnniing luinber having guide-rests E, with their carrying'-cl1ains, in tion with the adjustible saws B D, arrang'ed combination with saws B D, connected to the on separate arbors, one ahead of the other, subguide-rests and adjustable laterally with the stantially as and for the purposes described.

saws, substantially as and for the purposes de- In test-iinony that I claim the foregoing' as scribed. my own invention I hereto aflix my signature 2. The accommodation-saw C, monntcd on in presenee of two Witnesses.

a vertically-sliding frame, in combination with GEORGE "ASHINGTOX NICIIOLS.

the saws B D, substzintially as and for the Witnesses:

purposes described. H. R. MURDocK,

3. The feed devices J K K' L, in colnbina- F. V. COMFORT. 

